import java.util.List;

/**
 * @projectName: MyWebProject
 * @package: test
 * @className: test
 * @author: Eric
 * @description: TODO
 * @date: 2021/11/25 22:16
 * @version: 1.0
 */
public class test {

    public static void main(String[] args) {

        List<MyClass> list = null;
        for (MyClass s : list) {
            System.out.println(s);
        }


        int count = 0;
        int[][] a = new int[0][80];
        for (int i = 0; i < 4; i++) {
            count += a[i][i];
        }

    }

}

class MyClass {
    private int a;
    private int b;

}